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1) Why is it my internal measurements/calibrations are just fine as far as signal levels, yet when I go to make an actual measurement, the levels are way low, despite not changing *anything* between the internal checks and measuring.
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That's because the
Check Levels routine in the Measurement screen and the
Check Levels routine in the Settings screen use different values to generate the pink noise for level setting.
The Check Levels routine in the the Settings screen uses the fact that you have the
Check/Set levels with Subwoofer pull-down selected to generate its test noise. It uses a pink noise low cut of 30Hz and a high cut of 80Hz. This is the energy band that you use to set the Check Levels in the settings screen. See the first attached pic below.
But then to double check and verify that the
end frequency of the sweep that you have selected in the Measurement panel matches that subwoofer setting, its Check Level routine uses the end frequency as the test pink noise hi-limit cutoff. So if you had 20KHz as the end frequency to measure for your sweep, you can see how the pink noise would be different (between the two Check Levels) and as such you would experience quite a different level. See the second attached pic where 200Hz is the end frequency and the hi-cut of the pink noise is 200Hz. In this case there will be a small difference in the check level result.
Set the End Frequency in the Measurement panel to 200Hz.................. it should be fine.....
check_levels_settings.jpg check_levels_measure.jpg Quote:
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I understand I can change the sensitivity of the sound meter, but it was already set to 80, which I thought was appropriate?
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It is. I thought you might be using a higher one...
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2) The cabling I have is mini-stereo line out to dual RCA, converted to single RCA at the receiver end and input via the Right AUX channel. From the sound meter I have a Right-only RCA connected, going to the Right-only AUX2 connection on my X-Fi Platinum (which in this case is using an RCA line-level input on the front panel). Is this correct, or should the sound meter output be converted into a dual-mono signal?
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That all seems fine. The jacks on the soundcard are stereo, and we need to break them out into the two left and right channels as you've done.
Then you use one of those broken out channels for the line-in from the mic and the line-out to the receiver. I use a Y-splitter at the receiver to feed left and right AUX in so I can have both mains playing when the time comes - but whatever....
brucek